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• cannot link ffmpeg libraries for my own Qt project

  14 août 2013, par Dan T

  EDIT : Question solved (see bottom)

  I have spent MANY hours searching for a solution to my problem, but have not managed. I am on OSX and trying to link ffmpeg to my own Qt project. I have tried to do the simplest thing possible but even this does not work :

  After gettings yasm and x264 installed, I ran
  ./configure —enable-static —enable-gpl —enable-libx264 and then
  make && make install

  ffmpeg runs fine when I then try to run it on the command line. I then just set up a simple project in the ffmpeg directory with the following ffmpeg.pro file :

  TEMPLATE = app
  
  
  
  QT += core
  
  
  
  INCLUDEPATH += /usr/local/include
  
  LIBS += -L/usr/local/lib
  
  LIBS += -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -lpthread -lbz2 -lm -lz -lx264
  
  
  
  HEADERS += ffmpeg.h
  
  
  
  SOURCES += ffmpeg.c

  I'm not sure whether I need all those libraries, but they were all the .a files that ffmpeg created. When I try to build the project (as is), I get the following linker error :

  g++ -headerpad_max_install_names -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.5 -o ffmpeg.app/Contents/MacOS/ffmpeg ffmpeg.o -F/Users/dtamayo/QtSDK/Desktop/Qt/4.8.1/gcc/lib -L/Users/dtamayo/QtSDK/Desktop/Qt/4.8.1/gcc/lib -L/usr/local/lib -lavdevice -lavfilter -lavformat -lavcodec -lpostproc -lswresample -lswscale -lavutil -lpthread -lbz2 -lm -lz -lx264 -framework QtGui -L/usr/local/pgsql/lib -L/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib -F/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib -framework QtCore
  ld : warning : directory not found for option '-L/usr/local/pgsql/lib'
  ld : warning : directory not found for option '-L/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib'
  ld : warning : directory not found for option '-F/tmp/qt-stuff-85167/source/qt-everywhere-opensource-src-4.8.1/Desktop/Qt/4.8.1/gcc/lib'
  Undefined symbols for architecture x86_64 :
  "_audio_sync_method", referenced from :
  _write_frame in ffmpeg.o
  _do_audio_out in ffmpeg.o
  "_audio_volume", referenced from :
  _transcode_init in ffmpeg.o
  "_cmdutils_read_file", referenced from :
  _transcode_init in ffmpeg.o
  "_configure_filtergraph", referenced from :
  _decode_audio in ffmpeg.o
  _decode_video in ffmpeg.o
  _transcode_init in ffmpeg.o
  "_copy_tb", referenced from :
  _transcode_init in ffmpeg.o
  "_copy_ts", referenced from :
  _process_input in ffmpeg.o
  "_debug_ts", referenced from :
  _write_frame in ffmpeg.o
  _do_audio_out in ffmpeg.o
  _do_video_out in ffmpeg.o
  _decode_video in ffmpeg.o
  _process_input in ffmpeg.o
  "_do_benchmark", referenced from :
  _ffmpeg_cleanup in ffmpeg.o
  _main in ffmpeg.o
  "_do_benchmark_all", referenced from :
  _update_benchmark in ffmpeg.o
  "_do_hex_dump", referenced from :
  _check_keyboard_interaction in ffmpeg.o
  _process_input in ffmpeg.o
  "_do_pkt_dump", referenced from :
  _check_keyboard_interaction in ffmpeg.o
  _process_input in ffmpeg.o
  "_dts_delta_threshold", referenced from :
  _process_input in ffmpeg.o
  "_dts_error_threshold", referenced from :
  _do_video_out in ffmpeg.o
  _process_input in ffmpeg.o
  "_exit_on_error", referenced from :
  _write_frame in ffmpeg.o
  _do_subtitle_out in ffmpeg.o
  _process_input in ffmpeg.o
  "_exit_program", referenced from :
  _sigterm_handler in ffmpeg.o
  _assert_avoptions in ffmpeg.o
  _abort_codec_experimental in ffmpeg.o
  _write_frame in ffmpeg.o
  _do_audio_out in ffmpeg.o
  _do_subtitle_out in ffmpeg.o
  _do_video_out in ffmpeg.o
  ...
  "_ffmpeg_parse_options", referenced from :
  _main in ffmpeg.o
  "_frame_bits_per_raw_sample", referenced from :
  _transcode_init in ffmpeg.o
  "_iconv", referenced from :
  _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_iconv_close", referenced from :
  _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  _avcodec_open2 in libavcodec.a(utils.o)
  "_iconv_open", referenced from :
  _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  _avcodec_open2 in libavcodec.a(utils.o)
  "_init_simple_filtergraph", referenced from :
  _transcode_init in ffmpeg.o
  "_ist_in_filtergraph", referenced from :
  _decode_audio in ffmpeg.o
  _decode_video in ffmpeg.o
  "_options", referenced from :
  _main in ffmpeg.o
  (maybe you meant : _ff_mpv_generic_options, _ff_rawvideo_options , _av_set_options_string , _ff_rtsp_options )
  "_parse_loglevel", referenced from :
  _main in ffmpeg.o
  "_parse_time_or_die", referenced from :
  _parse_forced_key_frames in ffmpeg.o
  "_print_error", referenced from :
  _write_frame in ffmpeg.o
  _process_input in ffmpeg.o
  "_print_stats", referenced from :
  _print_report in ffmpeg.o
  "_qp_hist", referenced from :
  _print_report in ffmpeg.o
  _check_keyboard_interaction in ffmpeg.o
  "_register_exit", referenced from :
  _main in ffmpeg.o
  "_show_banner", referenced from :
  _main in ffmpeg.o
  "_show_usage", referenced from :
  _main in ffmpeg.o
  "_stdin_interaction", referenced from :
  _transcode in ffmpeg.o
  "_uninit_opts", referenced from :
  _ffmpeg_cleanup in ffmpeg.o
  "_video_sync_method", referenced from :
  _write_frame in ffmpeg.o
  _do_video_out in ffmpeg.o
  _transcode_init in ffmpeg.o
  "_vstats_filename", referenced from :
  _ffmpeg_cleanup in ffmpeg.o
  _do_video_out in ffmpeg.o
  _do_video_stats in ffmpeg.o
  _flush_encoders in ffmpeg.o
  ld : symbol(s) not found for architecture x86_64
  collect2 : ld returned 1 exit status
  make : Leaving directory `/Users/dtamayo/Desktop/ffmpeg-build-desktop-Desktop_Qt_4_8_1_for_GCC__Qt_SDK__Debug'
  make : * [ffmpeg.app/Contents/MacOS/ffmpeg] Error 1
  14:35:42 : The process "/usr/bin/make" exited with code 2.
  Error while building project ffmpeg (target : Desktop)
  When executing build step 'Make'

  ---

  EDIT :

  ---

  Thank you very much for your quick responses. I'm embarrassed to say that with the help of a friend I found the problem, so I'll add the solution here in case there are others as inept as I am that run into the same issue !

  The problem is that I hadn't added the following source files to the project, which do not get built as part of one of the ffmpeg libraries :

  cmdutils.c ffmpeg_filter.c ffmpeg_opt.c

  In addition, I had to add usr/lib to my library path, and add the library -liconv.

• What does the notation BGR refer to at the byte order level in opencv and ffmepg ?

  16 août 2017, par writalnaie

  I see the notation BGR occurs in many places in opencv (e.g. CV_YUV2BGR_YV12) and ffmpeg(e.g. AV_PIX_FMT_BGR24). My question is what is the byte order in these BGR formats in opencv and ffmpeg in some common little endianness architecture (such as x86/amd64). Is channel B stored in lower address or higher address compared with channel R in these formats ?

  Thanks !

• where to get precompiled binaries for Sox resampler library for android ?

  14 juillet 2017, par kc ochibili

  I have been using a sox precompiled binary from here https://github.com/guardianproject/android-ffmpeg-java/tree/master/res/raw

  but that binary only supports one cpu architecture. I am using a Galaxy s8 for testing so I need a binary that would support x86 and all other architecture including

  I have tried building the soxr library by my self but I encountered too many errors.
  So I am looking for a link to download a precompiled binary for sox.